Re: 9V Lithium battery explosion


Hi Sergio,
I asked Rodney in service to give you a call yesterday afternoon. The
contrast bias voltage on the LCD is probably set wrong. We normally
don't set it here since it is set by the manufacturer of the display
and usually they are correct. The voltage applied to the LCD
electronics by different raw power supplies (battery and external) can
vary by a small percentage. If the LCD bias voltage is right on the
edge, the different main voltages can make big visual differences.

It is also possible that the main switching regulator isn't regulating
in a normal manner. If that is the case, and the regulator voltage is
drifting, it would explain how the unit got out of here with a bad
display. A bad regulator would also explain why different power
sources result in such wide variation

As I understand the service record, we replaced that LCD for you but
apparently didn't look at it critically. Let us take a second look at
it and if it can't be adjusted properly we will replace it again with
a good one and/or replace the main regulator.
Best Regards,
Larry Fisher
Lectrosonics

On 19 Jul 2005 16:33:11 -0700, "Sergio Sanmiguel"
<soundsorcerer@xxxxxxxxxxxxx> wrote:

>Larry,
>I'm experiencing some problems with one of my 411's when using external
>power from a NP1
>The thing is that the LCD screen goes blank, but when running on
>internal batteries the screen seems to be dimmed down... Other than
>that the unit is still working fine and delivering clean sound
>regardless of the powering source. Any Ideas?
>
>Thanks,
>
>Sergio Sanmiguel
>~~

.

Relevant Pages

  • Re: Component suggestion...
    ... Although the PIC will run at lower voltages the LCD requires 5V. ... provice a voltage of between 4.8V and 6V. ... Brendan Gillatt ...
    (sci.electronics.components)
  • LCD display modes in modern laptops?!
    ... I would like to establish the exact way most laptop LCD displays work in ... pixels ON (i.e. applying the voltage to them) which is kind of opposite ... "blackness" in some of the screensavers and autopower display managers. ... saving and "time off" for relevant pixels, in some LCD displays this may ...
    (sci.electronics.misc)
  • Re: 12v TV
    ... voltage changing and regulation inside the set." ... from the gel battery on your caravan whilst the mains were connected ... that's just is, i doubt more than 2 people on here own a lcd tv of the same make, the names change almost daily as the chinese copy more big name brands, substituting parts for lower quality ones to get the price down. ... of course the advice the OP takes is worth exactly what he's paid for it, i.e. naff all, so if the TV blows it's backlight inverter, he can shout and moan at the people who said 'mine has never failed so yours wont' but he cant get them to pay for a new TV for him. ...
    (uk.rec.caravanning)
  • Re: 12v TV
    ... voltage changing and regulation inside the set." ... from the gel battery on your caravan whilst the mains were connected ... that's just is, i doubt more than 2 people on here own a lcd tv of the same make, the names change almost daily as the chinese copy more big name brands, substituting parts for lower quality ones to get the price down. ... of course the advice the OP takes is worth exactly what he's paid for it, i.e. naff all, so if the TV blows it's backlight inverter, he can shout and moan at the people who said 'mine has never failed so yours wont' but he cant get them to pay for a new TV for him. ...
    (uk.rec.caravanning)
  • Re: Help with power issues
    ... Do you really need to regulate the battery voltage at all? ... into an RC to get a lower voltage for the LCD. ... This type of regulator would ...
    (sci.electronics.design)